#define  _CRT_SECURE_NO_WARNINGS

#include"Date.h"

Date::Date(int year, int month, int day)
{
	_year = year;
	_month = month;
	_day = day;
}

Date::Date(const Date& d)
{
	_year = d._year;
	_month = d._month;
	_day = d._day;
}

void Date::Print()const
{
	cout << _year << '-' << _month << '-' << _day << endl;
}

Date& Date::operator =(const Date& d)
{
	_year = d._year;
	_month = d._month;
	_day = d._day;
	return *this;
}

Date::~Date()
{
	_year = 0;
	_month = 0;
	_day = 0;
}

Date& Date::operator +=(int day)
{
	if (day < 0)
	{
		return *this -= -day;
	}
	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		_month++;
		if (_month == 13)
		{
			_year++;
			_month = 1;
		}
	}
	return *this;
}

Date Date::operator +(int day)const
{
	Date temp(*this);
	temp += day;
	return temp;
}

Date& Date::operator -=(int day)
{
	if (day < 0)
	{
		return *this += -day;
	}
	_day -= day;
	while (_day <= 0)
	{
		_month--;
		if (_month == 0)
		{
			_year--;
			_month = 12;
		}
		_day += GetMonthDay(_year, _month);
	}
	return *this;
}

Date Date::operator -(int day)const
{
	Date temp(*this);
	temp -= day;
	return temp;
}

Date& Date::operator ++()
{
	*this += 1;
	return *this;
}

Date Date::operator ++(int)
{
	Date temp(*this);
	*this += 1;
	return temp;
}

Date Date::operator --(int)
{
	Date temp(*this);
	*this += 1;
	return temp;
}

Date& Date::operator --()
{
	*this -= 1;
	return *this;
}

bool Date::operator >(const Date& d)const
{
	if (_year > d._year)
	{
		return true;
	}
	else if (_year == d._year && _month > d._month)
	{
		return true;
	}
	else if (_year == d._year && _month == d._month)
	{
		return _day > d._day;
	}
	return false;
}

bool Date::operator ==(const Date& d)const
{
	return _year == d._year
		&& _month == d._month
		&& _day == d._day;
}

bool Date::operator >=(const Date& d)const
{
	return *this > d || *this == d;
}

bool Date::operator <(const Date& d)const
{
	return !(*this >= d);
}

bool Date::operator <=(const Date& d)const
{
	return !(*this > d);
}

bool Date::operator !=(const Date& d)const
{
	return !(*this == d);
}

int Date::operator -(const Date& d)const
{
	Date max = *this;
	Date min = d;
	int flag = 1;
	if (*this < d)
	{
		max = d;
		min = *this;
		flag = -1;
	}
	int n = 0;
	while (min != max)
	{
		n++;
		min++;
	}
	return n * flag;
}